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    \node(Figure24)[anchor=north] at (0,0){  
        \begin{tabular}{|m{3em}<{\centering}|m{3em}<{\centering}|m{3em}<{\centering}|m{3em}<{\centering}|}
            \hline 
            {\ }{}  & a & b & c \\ \hline
            A\{1,2\} & B\{2\} & C\{3,9\} & \\ \hline
            B\{2\} & B\{2\} & D\{9\} & \\ \hline
            C\{3,9\} &  &  & E\{3\} \\ \hline
            D\{9\} &  &  & \\ \hline
            E\{3\} &  &  & E\{3\} \\ \hline
        \end{tabular}
    };
    \node  (+2) at(-9.4em,-2.8em) {+};
    \node  (-4) at(-9.1em,-5.9em) {-};
    \node  (-5) at(-9.1em,-7.5em) {-};
    \node  (-6) at(-9.1em,-9.1em) {-};
    \draw (-8.37em,-0.05em) edge (-4.14em,-1.63em);
        
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